CTK/Libs/PluginFramework/ctkPluginPrivate_p.h

/*=============================================================================

  Library: CTK

  Copyright (c) 2010 German Cancer Research Center,
    Division of Medical and Biological Informatics

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

=============================================================================*/

#ifndef CTKPLUGINPRIVATE_P_H
#define CTKPLUGINPRIVATE_P_H

#include "ctkPlugin.h"
#include "ctkPluginException.h"
#include "ctkRequirePlugin_p.h"

#include <QHash>
#include <QPluginLoader>

namespace ctk {

  class PluginActivator;
  class PluginArchive;
  class PluginFrameworkContext;

  class PluginPrivate {

  protected:

    Plugin * const q_ptr;

  public:

    Q_DECLARE_PUBLIC(Plugin)

    /**
     * Construct a new plugin based on a PluginArchive.
     *
     * @param fw PluginFrameworkContext for this plugin.
     * @param ba Plugin archive representing the shared library and cached data
     * @param checkContext AccessConrolContext to do permission checks against.
     * @exception std::invalid_argument Faulty manifest for bundle
     */
    PluginPrivate(Plugin& qq, PluginFrameworkContext* fw,
               PluginArchive* pa /*, Object checkContext*/);

    /**
     * Construct a new empty Plugin.
     *
     * Only called for the system plugin
     *
     * @param fw Framework for this plugin.
     */
    PluginPrivate(Plugin& qq,
                  PluginFrameworkContext* fw,
                  long id,
                  const QString& loc,
                  const QString& sym,
                  const Version& ver);

    virtual ~PluginPrivate();

    /**
     * Get updated plugin state. That means check if an installed
     * plugin has been resolved.
     *
     * @return Plugin state
     */
    Plugin::State getUpdatedState();

    /**
     * Save the autostart setting to the persistent plugin storage.
     *
     * @param setting The autostart options to save.
     */
    void setAutostartSetting(const Plugin::StartOptions& setting);

    /**
     * Performs the actual activation.
     */
    void finalizeActivation();

    /**
     * Union of flags allowing plugin class access
     */
    static const Plugin::States RESOLVED_FLAGS;

    PluginFrameworkContext * const fwCtx;

    /**
     * Plugin identifier
     */
    const long id;

    /**
     * Plugin location identifier
     */
    const QString location;

    /**
     * Plugin symbolic name
     */
    QString symbolicName;

    /**
     * Plugin version
     */
    Version version;

    /**
     * State of the plugin
     */
    Plugin::State state;

    /**
     * Plugin archive
     */
    PluginArchive* archive;

    /**
     * PluginContext for the plugin
     */
    PluginContext* pluginContext;

    /**
     * PluginActivator for the plugin
     */
    PluginActivator* pluginActivator;

    /**
     * The Qt plugin loader for the plugin
     */
    QPluginLoader pluginLoader;

    /**
     * Time when the plugin was last modified
     */
    long lastModified;

    /**
     * Stores the default locale entries when uninstalled
     */
    QHash<QString, QString> cachedHeaders;

    /**
     * Stores the raw manifest headers
     */
    QHash<QString, QString> cachedRawHeaders;

    /**
     * True when this plugin has its activation policy
     * set to "eager"
     */
    bool eagerActivation;

    /** True during the finalization of an activation. */
    bool activating;

    /** True during the state change from active to resolved. */
    bool deactivating;

    /** Saved exception of resolve failure */
    //PluginException resolveFailException;

    /** List of RequirePlugin entries. */
    QList<RequirePlugin*> require;

  private:

    /**
     * Check manifest and cache certain manifest headers as variables.
     */
    void checkManifestHeaders();

    // This could potentially be run in its own thread,
    // parallelizing plugin activations
    void start0();

    /**
     * Remove a plugins registered listeners, registered services and
     * used services.
     *
     */
    void removePluginResources();


  };

}

#endif // CTKPLUGINPRIVATE_P_H